Adjustable voltage converter, 10-12/2-15 volts. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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Those who have tried to use a car battery to power electronic devices are familiar with this problem - although the battery voltage should be approximately 12V, in reality it can be 11V or even less (depending on the condition of the battery).
But to power many devices, a stable voltage of 12 V or even 15 ... 18 V is required. The problem can be solved using a voltage converter.
For small currents (maximum 1 A), the proposed circuit can be used. With an input voltage of 10 to 12 V, the output voltage can be adjusted within 2 ... 15 V. The circuit (Fig. 4.71) is very simple.
The battery voltage is primarily doubled using a standard bass amplifier IC (TDA2002 or TDA2003). The voltage from its output is fed to the voltage regulator (LM317), which provides an output voltage of 2 to 15 V and a load current of up to 1 A.
The maximum current depends on the output voltage (since the power loss of the regulator depends on the voltage).
To do this, you only need to change the 390 ohm resistor from the LM317 stabilizer to a 470 ohm resistor. Setting up the device is very simple. The voltage doubler is checked first.
To do this, it is best to connect the device to the laboratory network unit and gradually increase the voltage. The output voltage should be about twice the input voltage. If this is not the case, most likely there is an installation error or poor soldering somewhere.
Author: Semyan A.P.
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